.footer {
  position: relative;
  width: 100%;
  height:100%;
  background: linear-gradient(rgba(0, 0, 0, .3), rgba(0, 0, 0, .3)),url('../img/4007.png') no-repeat center;
  background-size: cover;
  color: #fff;
}
.footer .title {
  padding: 100px 0 30px 0;
  text-align: center;
}
.footer .title .cn {
  font-size: 36px;
}
.footer .title .en {
  font-size: 24px;
}
.footer .nav{
  width: 60%;
  margin: 30px 20%;
  background-color: rgb(255, 255, 255, 0.3);
}
.footer .nav ul {
  display: flex;
  justify-content: center;
}
.footer .nav a {
  display: block;
  padding: 10px 30px;
  text-decoration: none;
  color: #fff;
  transition: background-color 0.25s;
}
.footer .nav a:hover {
  background-color: rgb(255, 255, 255, 0.4);
}
.copyright {
  padding: 20px 0 60px 0;
}
.copyright p {
  text-align: center;
  letter-spacing: 3px;
}